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충돌 안정성, 소음진동 및 내구의 다분야 통합 최적설계를 이용한 차체구조의 경량화
김효식(Hyosig Kim),인준교(Junkyo In) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
This paper presents a study on the multidisciplinary design optimization compromising Crashworthiness, NVH and Durability for weight reduction of a vehicle body structure. The objective function is the weight of the body structure. The design constraints are selected from the major performance responses from NVH, Crashworthiness and Durability. And the design variables consisted of three categories: panel thicknesses, material grades and presence/absence of structural parts. NVH performance is estimated with two kinds of computational models: BIW(Body in White) and BIG(Body in Grey: Semi full vehicle). In case of BIW, two fundamental modal frequencies of 1st torsional and 1st bending modes are traced. In case of BIG, total 32 IPI(Input Point Inertance) at the body mountings are investigated and total 58 VTF(Vibration Transfer Function) of panels encompassing the acoustic cavity are studied. The targets of these NVH related responses have been deployed from the vibro-acoustic standard. CRASH requirement is investigated with 3 kinds of crash protocols: Frontal crashworthiness: BFD(Frontal Deformable Barrier) and 2 side ones: AEMDB of KNCAP and ENCAP. DURABILITY criteria is investigated with not only fatigue damages of structural panels but also failures of spotwelds. To find the optimal design candidates, this study adopts the meta-models using RSM(Response Surface Model) which are obtained through DOE(Design of Experiments). And then Genetic algorithm is used to search out the global minimums with the metamodels. This study finds a few configurations that can save the weight of the selected parts from 4.9 % up to 10.3 % of the baseline design. The proposed configuration presents a satisfactory compromise between the performances and weight reduction, although it is complicated to gain a balance because they are more contradictory under the modern Paradigem: front-loading design and reduction of development time.
김효식(Hyosig Kim),김태영(Taeyoung Kim),이홍우(Hongwoo Lee) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Design for six sigma or sigma based robust design will have a major influence on the future design, if it is applied during<br/> the conceptual design phase or design change phase. This will result in more improved but less expensive mechanism. This<br/> paper presents the implementation of a DFSS(Design For Six Sigma) for robust design of a brake judder of heavy duty trucks.<br/> Comparison of results according to design strategies, that is, a conventional deterministic optimization and a probabilistic one<br/> using a proposed sigma based robust design method, make clear the reason why the proposed one is necessary and the role of<br/> DFSS.
6시그마 설계의 IDDOV 모델을 이용한 제동시 이상 진동 품질개선
김효식(Hyosig Kim),김상섭(Sangsup Kim),임홍재(Hongjae Yim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Design for Six Sigma(DFSS) will have a major influence on the future design, if it is applied during the conceptual design phase or design change phase. This paper discusses an approach of Design for Six Sigma using IDDOV model in order to improve braking quality. Because the proposed model focus in preventing failures from happening and can be effectively applied to stages of research, design and development. The proposed model is more effective than the existing models, such as, DMAIC. This will result in more improved but less expensive satisfaction of customer. Examination of results according to the design strategy makes clear the reason why the DFSS with IDDOV model is necessary.